#pragma once
#include <iostream>
#include "Protocol.hpp"

enum{
    Div_Zero = 1,
    Mod_Zero,
    Other_Oper,
};

class ServerCal
{
public:
    ServerCal()
    {
    }
    Response CalculatorHelper(const Request &req)
    {
        Response resp(0, 0);
        switch (req.op)
        {
        case '+':
            resp.result = req.x + req.y;
            break;
        case '-':
            resp.result = req.x - req.y;
            break;
        case '*':
            resp.result = req.x * req.y;
            break;
        case '/':
            {
                if (req.y == 0) resp.code = Div_Zero;
                else resp.result = req.x / req.y;
            }
            break;
        case '%':
            {
                if (req.y == 0) resp.code = Mod_Zero;
                else resp.result = req.x % req.y;
            }
            break;
        default:
            resp.code = Other_Oper;
            break;
        }
        return resp;
    }

    // "len"\n"10 + 20"\n
    std::string Calculator(std::string &package)
    {
        std::string content;
        bool r = Decode(package, &content); // "len"\n"10 + 20"\n
        if (!r) return "";
        // "10 + 20"
        Request req;
        r = req.Deserialize(content);  // "10 + 20"  -> x=10 op=+ y=20
        if (!r) return "";

        content = ""; //
        Response resp = CalculatorHelper(req); // result=30 code=0;
        resp.Serialize(&content); // "30 0"
        content = Encode(content);  // "len"\n"30 0"
        return content;
    }
    ~ServerCal()
    {
    }
};